There are at least a few ways to accomplish this for XHTML output.
Please refer to the “pgwide” attribute description in the DITA Language Reference for the
element. If you prefer not to handle this in the XML source you can alter the XSLT that generates your XHTML so that all tables have their “width” attribute set to “100%” (or something close to that), or you could simply add a CSS property to your CSS file that gives all table elements a width of “100%” (or something close to that), or just specific table elements with a specific “class” attribute using the DITA “outputclass” attribute (again, please refer to the DITA Language Reference for details).
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